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Glama

Word Aligner MCP

Server Details

Word Aligner exposes an MCP server so AI agents can turn a phrase and its translation into a shareable word-alignment diagram. The server runs over Streamable HTTP at aligner.tinygods.dev/mcp with no authentication and a single tool, create_word_alignment. An agent translates and tokenizes the text, works out which words correspond, calls the tool, and gets back a URL plus a preview image.

Status
Healthy
Last Tested
Transport
Streamable HTTP
URL

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Tool DescriptionsA

Average 4.6/5 across 1 of 1 tools scored.

Server CoherenceA
Disambiguation5/5

With only one tool, there is no possibility of confusion between tools. The tool's purpose is clearly defined in its description.

Naming Consistency5/5

The single tool name 'create_word_alignment' follows a clear verb_noun pattern, which is consistent and predictable.

Tool Count4/5

The server has only one tool, which is below the typical 3-15 range. However, for its narrow scope of creating word alignment diagrams, this single tool feels reasonable and not excessive.

Completeness3/5

The server provides a comprehensive create operation with detailed tokenization options, but lacks any retrieval, update, or delete capabilities. This is a notable gap for a full lifecycle, but the tool fully addresses its stated purpose of generating a diagram.

Available Tools

1 tool
create_word_alignmentCreate word alignment diagramA
Read-onlyIdempotent
Inspect

Create a shareable Word Aligner diagram that shows which words match across two or more stacked lines of text (a translation and its source, an interlinear gloss, IPA, etc.). Returns a URL that opens the interactive diagram, plus a preview image.

Use this when the user wants to translate a phrase and show word correspondences, align a translation with its source (including RTL scripts like Hebrew or Arabic), or build a Leipzig-style interlinear gloss.

Word indices are 0-based token positions. Tokenize each line the same way the tool does before assigning indices:

  • Whitespace always splits ("I have been going" -> I[0] have[1] been[2] going[3]).

  • The characters in settings.tokenSplitChars (default ".-|") also split and are then removed from the rendered text, so "go.PST.IPFV" becomes three tokens (go, PST, IPFV) and the dots disappear. For Leipzig glosses set tokenSplitChars to "-|" to keep the dots.

  • Punctuation stays attached by default ("Hello, world!" -> Hello,[0] world![1]).

  • In RTL lines, word 0 is the logically first word (rightmost on screen); index in reading order.

Each alignment is [lineA, wordA, lineB, wordB]; the two lines must be vertically adjacent (|lineA - lineB| = 1). To express many-to-one, list each target word as its own tuple. Tokens that share a connection group get the same color automatically.

ParametersJSON Schema
NameRequiredDescriptionDefault
linesYesText lines, top to bottom. Each entry is a plain string or an object with per-line visual options.
pairsNoPer-pair controls for a specific adjacent line pair.
settingsNoGlobal visual overrides. Unset fields inherit defaults.
alignmentsNoWord-alignment links as [lineA, wordA, lineB, wordB] (0-based indices, lines must be adjacent).

Output Schema

ParametersJSON Schema
NameRequiredDescription
urlYesThe shareable diagram URL. Return this to the user exactly as received, character for character.
Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare the tool as read-only (readOnlyHint=true) and not destructive. The description goes far beyond by detailing tokenization rules (whitespace, tokenSplitChars, punctuation attachment), RTL index order, alignment constraints (adjacent lines, many-to-one representation), and automatic color grouping. No contradictions with annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is lengthy but justified by the tool's complexity. It front-loads the core purpose and return type, then dives into critical usage details. Every sentence serves a purpose (tokenization, RTL handling, alignment syntax). Minor trimming could be possible, but overall it is well-structured and not verbose for the depth of information.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's complexity (4 parameters, nested objects, no sibling tools), the description is complete. It covers purpose, return type, tokenization, alignment rules, global settings, and per-line options. The presence of an output schema (URL + preview image) and full schema coverage means the description does not need to explain return values—it already does. No gaps noted.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so baseline is 3. However, the description adds significant value by explaining how to use parameters like tokenSplitChars for Leipzig glosses, the meaning of RTL index order, and the format of alignments. It also clarifies the default character for tokenMergeChar and the behavior of tokenSplitChars. This goes beyond what the schema provides.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states it creates a shareable Word Aligner diagram showing word matches across stacked lines of text. It lists specific use cases (translation, interlinear gloss, RTL) and explains the return value (URL + preview image). The tool has no siblings, so differentiation is not needed, but the purpose is specific and actionable.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description explicitly spells out when to use the tool: for translation word correspondences, source alignment (including RTL), and Leipzig-style glosses. It also provides tokenization instructions and clarifies how punctuation is handled. While it does not explicitly state when not to use, the context is clear enough given no sibling tools.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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